CN210089813U - Simple and easy calibrating device of vapour-pressure type level gauge - Google Patents
Simple and easy calibrating device of vapour-pressure type level gauge Download PDFInfo
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- CN210089813U CN210089813U CN201920827231.8U CN201920827231U CN210089813U CN 210089813 U CN210089813 U CN 210089813U CN 201920827231 U CN201920827231 U CN 201920827231U CN 210089813 U CN210089813 U CN 210089813U
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- liquid level
- calibration
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Abstract
The utility model relates to a simple and easy calibrating device of vapour-pressure type level gauge, include: the calibration device flange, one section sealed pipeline that can bear certain gas pressure, sealed pipeline's first end with calibration device flange fixed connection, sealed pipeline's second end is provided with the air supply entry, has set gradually standard digital display manometer, precision pressure gauge, blowoff valve, relief pressure valve, manometer, stop valve on the sealed pipeline. A simple calibration method for a pneumatic liquid level meter uses a pneumatic calibration mode to replace a traditional water calibration mode. The calibration device of the utility model has simple structure, easy operation, time and labor saving, convenient use, greatly reduced workload, improved reliability and practicability; the traditional water calibration mode is replaced, the liquid level meter calibration is not carried out by water injection, water resources are saved, and the economic cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of the industry measurement, concretely relates to a simple and easy calibrating device of vapour-pressure type level gauge for in the aspect of oil, chemical industry, light industry level measurement.
Background
In the aspect of liquid level measurement in petroleum, chemical and light industries, a liquid level meter is one of the commonly used measuring devices. In order to guarantee the accuracy of the measurement, the level gauge needs to be calibrated. In the use of level gauge, some reliability requirements are high and special work occasion, need regularly to calibrate the level gauge, guarantee that the level gauge can normally work.
At present, the conventional calibration mode of the liquid level meter adopts a water calibration mode, water is injected into an equipment tank, the height of the water level and the liquid level is changed, the display of the liquid level meter is observed, the value of the liquid level meter is recorded, and then whether the precision of the liquid level meter can meet the use requirement is converted according to the difference between the water density and the density of a used medium. This calibration is very tedious, time consuming, laborious, and water consuming.
Disclosure of Invention
For solving the technical problem, the utility model provides a simple and easy calibrating device of vapour-pressure type level gauge and calibration method utilizes the level gauge measurement principle, uses compressed gas pressure to replace the pressure that the interior liquid level of tank produced, utilizes the pressure size of relief pressure valve adjustment compressed gas to replace the change of liquid level in the tank, utilizes precision pressure table or the digital display manometer of standard to read the pressure value, compare with the pressure value that the level gauge shows, thereby calculate the level gauge precision, judge whether the level gauge precision can satisfy the requirement of using. By the simple calibrating device and the simple calibrating method, the flange diaphragm type liquid level meter can be calibrated, so that the liquid level meter can display accurate parameters in the using process. The utility model discloses the technical scheme who adopts as follows:
a simple calibration device for a pneumatic liquid level meter comprises: the calibration device flange, one section sealed pipeline that can bear certain gas pressure, sealed pipeline's first end with calibration device flange fixed connection, sealed pipeline's second end is provided with the air supply entry, has set gradually standard digital display manometer, precision pressure gauge, blowoff valve, relief pressure valve, manometer, stop valve on the sealed pipeline.
By utilizing the simple calibrating device of the utility model, the liquid level meter to be calibrated is connected with the flange of the simple calibrating device through the connecting flange, and the liquid level meter to be calibrated is connected with the 24VDC power supply and the manual operator and is used for displaying the current pressure and the liquid level of the liquid level meter; then, inflating the sealed pipeline, then gradually deflating through a pressure reducing valve, and calibrating the liquid level metering process according to 25%, 50%, 75% and 100% of the measuring range; and comparing the values read by the manual operator and the standard digital display type pressure gauge so as to convert the precision of the liquid level gauge.
The utility model has the advantages that:
1) the calibration device of the utility model has simple structure, easy operation, time and labor saving, convenient use, greatly reduced workload, improved reliability and practicability;
2) the utility model discloses replace traditional water school mode, no longer rely on the water injection to carry out the level gauge calibration, practiced thrift the water resource, reduced economic cost.
Drawings
Fig. 1 is a schematic diagram of a simple calibration device structure and field connection according to embodiment 2 of the present invention;
in the figure, 1-a liquid level meter, 2-a connecting flange, 3-a pressure taking diaphragm, 4-a calibrating device flange, 5-a welding ring, 6-a first stainless steel pipe, 7-a blind plate, 8-a standard digital display pressure gauge, 9-a precision pressure gauge, 10-a pressure reducing valve, 11-a pressure gauge, 12-a stop valve, 13-an air source inlet, 14-a manual operator, 15-24 VDC power supply, 16-an exhaust valve, 17-a second stainless steel pipe and 18-a simple calibrating device.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Example 1
The pressure-taking diaphragm is a component of the liquid level meter. The pressure-taking diaphragm and the connecting flange are part of a calibrated liquid level meter, the pressure-taking diaphragm and the connecting flange are welded together, silicon oil is filled in the pressure-taking diaphragm, the pressure-taking diaphragm senses pressure change of an external medium (here, the pressure change sensed by a simple calibrating device) and transmits the pressure to the liquid level meter through silicon oil conduction, and the liquid level meter can accurately measure the change of the liquid level (or the pressure). The level gauge is here a finished gauge. The pressure-taking diaphragm is connected with external equipment to sense the change of the pressure of the external medium to be detected.
A simple calibration device for a pneumatic liquid level meter comprises: the calibrating device flange, one section sealed pipeline that can bear certain gas pressure, sealed pipeline's first end with the calibrating device flange pass through welded fastening and connect, sealed pipeline's second end is provided with the air supply entry, last standard digital display manometer, precision pressure gauge, blowoff valve, relief pressure valve, manometer, the stop valve of having set gradually of sealed pipeline. When the liquid level meter is calibrated, a connecting flange of the liquid level meter and a calibrating device flange of the simple calibrating device are required to be connected together, the two flanges are fixed together through bolts, and a rubber sealing gasket is arranged between the two flanges for preventing air leakage.
During from the air supply entry with compressed gas access seal pipe, come the letting in of control compressed gas by the stop valve, through relief pressure valve adjustment compressed gas's atmospheric pressure size, replace the change of tank liquid level, read accurate pressure value from accurate manometer and standard digital display manometer, compare with the pressure value that the level gauge shows again, whether the precision of level gauge just can be recalculated can satisfy the operation requirement. After the calibration is finished, the gas of the sealed pipeline is exhausted through the exhaust valve.
Example 2
As shown in fig. 1, it is a schematic diagram of the structure and field connection of the simple calibrating device according to embodiment 2 of the present invention, wherein a simple calibrating device 18 is shown in a dashed-line frame. A simple calibration device for a pneumatic liquid level meter comprises: the pressure measuring device comprises a liquid level meter 1, a connecting flange 2, a pressure measuring diaphragm 3, a calibrating device flange 4 (a flange of DN80 can be adopted), a welding ring 5, a first stainless steel pipe 6 (a DN80 stainless steel pipe of 150mm can be adopted), a blind plate 7 and a second stainless steel pipe 17 (a DN80 stainless steel pipe of 10mm can be adopted), wherein one end of the first stainless steel pipe 6 is fixed with the calibrating device flange 4 in a sealing way through the welding ring 5, the other end of the first stainless steel pipe 6 is sealed through the blind plate 7, and the second stainless steel pipe 17 is welded in a hole in the middle of the blind plate 7 to serve as a pressure measuring point; an air source inlet 13 is arranged at the end part of the second stainless steel pipe 17, a standard digital display type pressure gauge 8, a precision pressure gauge 9, an exhaust valve 16, a pressure reducing valve 10, a pressure gauge 11 and a stop valve 12 are sequentially arranged on the second stainless steel pipe 17, and the pressure taking diaphragm 3 is positioned in the first stainless steel pipe 6. In calibrating the gauge 1, the gauge 1 to be calibrated is connected to a 24VDC power supply 15 and a hand operator 14 for displaying the current pressure and level of the gauge. A calibrating device flange 4 of the simple calibrating device is hermetically connected with a calibrated liquid level meter 1 through a connecting flange 2, the second stainless steel pipe 17 is inflated through an air source inlet 13, and the air in the stainless steel pipe is sealed through a stop valve 12; the pressure reducing valve 10 is used for adjusting the pressure of compressed gas to replace the change of the liquid level of the tank, the accurate pressure value is read through the precision pressure gauge 9 and the standard digital display type pressure gauge 8 and is compared with the pressure value displayed by the liquid level meter 1, and therefore whether the precision of the liquid level meter 1 can meet the use requirement or not is calculated. After calibration is complete, the stainless steel tube is evacuated of gas via an evacuation valve 16.
The standard digital display type pressure gauge 8, the precision pressure gauge 9, the emptying valve 16 and the pressure gauge 11 can be connected with a second stainless steel pipe 17 through a three-way pipe.
Utilize above-mentioned vapour-pressure type level gauge simple and easy calibrating device to carry out the level gauge, including the following step:
and 3, putting the stop valve in a closed state, putting the emptying valve in an open state, checking the zero point of the liquid level meter, wherein the liquid level meter adopts a standard current signal of 4-20mA (milliampere), and the zero point state can read out a 4mA signal from the manual operator 14 corresponding to 0-measuring range, which indicates that the signal is zero point, and if the signal is not 4mA, zero point calibration is required according to the specification of the liquid level meter.
Step 4, closing the emptying valve, opening the stop valve, and reading the pressure value of the pressure gauge, wherein the pressure value is the current maximum pressure value of the sealed pipeline;
step 5, adjusting the pressure reducing valve to read the current pressure value through a standard digital display type pressure gauge or a precision pressure gauge, and comparing the current pressure value with the pressure value read by a manual operator;
step 6, checking the range of the liquid level meter, calculating the pressure value of the pressure reducing valve to be regulated according to a measurement calculation formula 1m water column which is 10kpa, and calibrating the range according to 25%, 50%, 75% and 100% of the range;
step 7, comparing values read by the manual operator and the standard digital display type pressure gauge, and converting the precision of the liquid level gauge;
and 8, after the verification is finished, closing the stop valve, opening the emptying valve to empty gas, and disassembling the liquid level meter and the simple verification device.
The utility model discloses the measurement principle of level gauge calibration is: as the height of the liquid column of the tank level changes, the static (differential) pressure generated at the pressure tapping point changes accordingly. The liquid pressure calculation formula P is rho g h (P: the pressure Pa and rho detected by the liquid level meter: the density kg/m 3 of the measured liquid, g is the gravity acceleration according to 9.8N/kg, and h is the liquid level height or depth mm), and h is P/(g rho). Such as water, substituting a constant value: 1000kg/m 3 for rho, 9.8N/kg, then: the pressure of 1mm water column is: p1000, 1mm water 10 pa. 1m water column 10 kpa. The industrial compressed gas is 0.7MPa 70kpa 70m water column. The utility model discloses replace the pressure variation that the tank liquid level height produced with the pressure variation of compressed gas, but the highest calibration reaches the tank jar body height 70 meters's level gauge, can satisfy industrial application completely.
Claims (4)
1. The utility model provides a simple and easy calibrating device of vapour-pressure type level gauge which characterized in that includes: the calibration device flange, one section sealed pipeline that can bear certain gas pressure, sealed pipeline's first end with calibration device flange fixed connection, sealed pipeline's second end is provided with the air supply entry, has set gradually standard digital display manometer, precision pressure gauge, blowoff valve, relief pressure valve, manometer, stop valve on the sealed pipeline.
2. The apparatus of claim 1, wherein the sealed conduit comprises: the device comprises a welding ring (5), a first stainless steel pipe (6), a blind plate (7) and a second stainless steel pipe (17), wherein one end of the first stainless steel pipe (6) is fixed with a flange of the calibrating device in a sealing mode through the welding ring (5), the other end of the first stainless steel pipe (6) is sealed through the blind plate (7), and the second stainless steel pipe (17) is welded in a hole in the middle of the blind plate (7) to serve as a pressure taking point.
3. The simple calibrating device for pneumatic liquid level meter as claimed in claim 2, wherein the standard digital pressure gauge, the precision pressure gauge, the emptying valve and the pressure gauge are connected with the second stainless steel tube (17) through a three-way pipe.
4. A pneumatic gauge simplistic calibration device as set forth in any one of claims 1-3 wherein said first end of said sealed conduit is fixedly attached to said calibration device flange by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920827231.8U CN210089813U (en) | 2019-06-03 | 2019-06-03 | Simple and easy calibrating device of vapour-pressure type level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920827231.8U CN210089813U (en) | 2019-06-03 | 2019-06-03 | Simple and easy calibrating device of vapour-pressure type level gauge |
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| Publication Number | Publication Date |
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| CN210089813U true CN210089813U (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920827231.8U Expired - Fee Related CN210089813U (en) | 2019-06-03 | 2019-06-03 | Simple and easy calibrating device of vapour-pressure type level gauge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780834A (en) * | 2020-07-21 | 2020-10-16 | 安东仪器仪表检测有限公司 | Calibration method of pressure liquid level meter |
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2019
- 2019-06-03 CN CN201920827231.8U patent/CN210089813U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780834A (en) * | 2020-07-21 | 2020-10-16 | 安东仪器仪表检测有限公司 | Calibration method of pressure liquid level meter |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200218 |